Most properties in France do not have an earth supplied by EDF, it is necessary for the client to provide their own earth this can be: an earth spike, spikes or earth cable in the ground dependant on ground conditions. Even when EDF put in a new supply or reconnect an old one they do not test the earth, as it is the owners' responsibility.
To ensure your earthing is adequate it is necessary to measure the earth loop impedance. This is the resistance between the earthing system you have and the transformer earth at the origin of your supply.